gres
Full Member level 4
It's a very simple project of power supply. There's nothing special inside: well none integrated voltage stabilizer 78xx, power transistors and filtering condensers with summary capacity 24.700uF
Most power goes to transistors, that's why we need such big radiator.
Power supply was made to work with big project that require effective power, system should work with maximum 25A
Firstly I wanted to put one powerfull transistor, but i've found two BD250 at my drawer and didin't want to waste them
Additional system consist stabilizers : 5V and 12V/1A ( to power integrated circuits, cooler system and more)
Board is made on thermotransfer mode (could be better)
Tests results are good:
- it can hold two car bulbs
- stabilization is quite good: no voltage pulsation at 20A
- when shorting ( without fuse) temperature of transistors rise, but not very much, and nothing wrong except that.
- cooling: with this radiator no need to install ventilator - it's just a little hot on big current)
Elements:
Condensers:
100nF MKT - 6 units
10uF/50V 1 unit
47 uF/35V - 2 units
10.000 uF - 2 units
4.700 uF - 1 unit
Resistors:
100 ohms /10W - 1 unit
0.15 ohms /5W - 2 units
Semi condensers
Stabilizer 7812 - 2 units
Stabilizer 7805 - 1 unit
Transistor BD250 - 2 units
Rectify bridge 25A - 1 unit
Others:
Goldpin 8 units ( pins)
1m cable
Radiators
Original text at https://www.elektroda.pl/rtvforum/topic1469050.html
